New answers tagged chromakey
This is quite simple. Use any keyer of your choice that can give you a good mask for the layer, then place an "Alpha Adjust" layer below it in the Effects control and click the "Invert Alpha" checkbox. This will invert the alpha channel produced by the keyer and reverse the effect the way you are looking for.
Not specific to Premiere, but the general technique is: Set up the key to drop out the color of choice, then invert the key.
What you're looking for is a difference matte. (Not to be confused with a Color Difference Key which is similar to regular chroma key.) It can certainly be done, though you should know that difference mattes are fairly temperamental. The way it works is by finding the difference between an image and each frame of video, and removing anything that's the ...
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